Re: Locks
Re: Locks
- Subject: Re: Locks
- From: koko <email@hidden>
- Date: Tue, 06 Dec 2011 20:07:15 -0700
I did come across OSAtomicIncrementXX … thanks.
I cannot use NSLock as this is in a BSD Static lib and I am required to implement as close to windows as possible.
So my code looks like below and is isomorphic to the Windows implementation.
=========
LONG volatile Mylock = 0;
void SetLock()
{
while(Mylock){Sleep(0);}; // Give up timeslice
#ifndef MAC
InterlockedIncrement(&Mylock);
#else
OSAtomicIncrement32(&Mylock);
#endif
}
void FreeLock()
{
#ifndef MAC
OSInterlockedDecrement(&Mylock);
#else
OSAtomicDecrement32(&Mylock);
#endif
}
===========
Thanks.
-koko
On Dec 6, 2011, at 5:39 PM, Conrad Shultz wrote:
> On 12/6/11 3:28 PM, koko wrote:
>> In windows we have:
>>
>> LONG volatile Mylock = 0;
>> InterlockedIncrement(&Mylock);
>> InterlockedDecrement(&Mylock);
>>
>>
>> What should these be replaced with for OSX as in :
>
> Have you read the Threading Programming Guide?
>
> I'm not a Windows developer, so I had to look up the MSDN docs, and
> based on those it seems like you want the OSAtomicIncrementxxx (and
> matching OSAtomicDecrementxxx) as direct analogues.
>
> However, since it sounds like you are trying to use these functions to
> implement locking in a multithreaded application, perhaps you should
> also examine whether higher level constructs would prove sufficient. A
> couple such mechanisms you can read about are NSLock and the
> @synchronized directive. GCD has some features (dispatch semaphores and
> barrier blocks come to mind) that may also be helpful in certain
> circumstances.
>
> --
> Conrad Shultz
>
> Synthetiq Solutions
> www.synthetiqsolutions.com
>
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| References: | |
| | >Locks (From: koko <email@hidden>) |
| | >Re: Locks (From: Conrad Shultz <email@hidden>) |